(347) 552-2258 help@rossmanngroup.com

Charging problems

Status
Not open for further replies.
JorgePayar

JorgePayar

Member
Hi, I nearly "fixed" a 820 3115b, It passed all ASD tests, EFI...hardware tests...with no errors, but I can see that when I plug an original apple charger, sometimes charge, sometimes not, even the light shows green but after a few seconds the led turns off, but in OS it says that is charging but it is not really.
What could it be?smc?
 
L

leonattpcs

New member
So is the the 1 wire issue damage/fault to the connector or is it wear and tear on contacts causing lack of electrical contact?
 
JorgePayar

JorgePayar

Member
Ok, I started checking continuity with some caps around u7000 and resistors, the macbook pro wasn't connected to the charger, I tested the continuity only half second in c7050 and u7000 did a short and fried!! I had to replaced it and now it recognize when I plug the charger but it says that the battery is not charging :( I don't know what I did wrong
 
larossmann

larossmann

Administrator
Staff member
BTW, a fucked up ISL6259 can short the current sensing section to ground and kill the sense resistors.
 
JorgePayar

JorgePayar

Member
Thanks for the hints :)
Ok I have measure them and pins in ISL6259 17-18 are: 141,1 Ohms pin 27-28 are: 0,20 Ohms, then R7050 0,001Ohms R7051 139,6 Ohms (probably fucked up R7052 0 Ohms
R 7020 0 Ohms R7021 10 Ohms R7022 10Ohms I´ve been measuring others around the u7000 area and they look good as the schematics says.
So I think I have to change the resistor r7051, or do you think could be a blown trace?
 
JorgePayar

JorgePayar

Member
I´ve replaced r7051 but It keeps saying the same the OS: "the battery is not charging" :( bad u7000? ?bad trace?? stupid repair guy (me)? I think could be the last question :)
Any more ideas?

Edit: Ok now Im watching this video: https://www.youtube.com/watch?v=PtEDoMV5oe8 and Im going to check for bad traces around u7000
 
Last edited:
JorgePayar

JorgePayar

Member
leonattpcs said:
So is the the 1 wire issue damage/fault to the connector or is it wear and tear on contacts causing lack of electrical contact?
Click to expand...

No, all contacts seems to be ok, I use the same charger for another macbook pro and it is fine, the connector from the battery is fine too, works well.
 
D

D_R

New member
It has to be 18.5V. <= I talk about Pin 2 on U7000
Have you checked F6905 and D7005? What Voltage do you have here?
 
A

aprendiz

Moderator
with a 60W charger this voltage is ok, measure in diode mode F7040 red probe to ground.............check sense resistors R7020-R7021 and ACIN
 
Status
Not open for further replies.
Top